The Control of Reaction Selectivity and Stability of Catalysts By Spillover Processes

Delmon, Bernard
(1994) Heterogeneous Chemistry Reviews : the review journal devoted to the chemistry and molecular physics of surfaces, interfaces, materials, colloids, polymers and biopolymers — Vol. 1, n° 3, p. 219-230 (1994)

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  • Delmon, BernardUCLouvain
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Abstract
An overview of a group of phenomena which provide inorganic catalysts with some of the fascinating properties of enzymes is presented. These phenomena occur because reactive atoms like H or O produced by dissociation of molecular hydrogen or oxygen, respectively, are highly mobile on certain surfaces. They can jump from the surface on which they have been formed to another one of a different nature, and bring about reactions on or over this latter surface. This is the spillover phenomenon. Effects attributed to spillover were first observed in reactions of solids. I shall show that the consequences of spillover in the field of catalysis that have been discovered over the years have had increasing importance. In addition to removal of coke, the inhibition or acceleration of solid state transformations due to spillover species can have a considerable impact on catalyst stability. The continuous creation of active sites by spillover (remote control) is a key process in many catalytic oxidations, and its role in hydrodesulfurization and reactions involved in hydrotreating is now receiving strong confirmation: these are two groups of reactions which correspond to major areas in catalytic science and technology. The structure of the sites and the mechanism by which they are generated begin to be elucidated. This short review also alludes to experimental methods that help distinguish effects due to spillover from other synergetic actions.
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Delmon, B. (1994). The Control of Reaction Selectivity and Stability of Catalysts By Spillover Processes. Heterogeneous Chemistry Reviews : the review journal devoted to the chemistry and molecular physics of surfaces, interfaces, materials, colloids, polymers and biopolymers, 1(3), 219-230. https://hdl.handle.net/2078.5/43712 (Original work published 1994)